@article{COLE,
	author 	= {R. G. Cole and J. H. Rosenbluth},
	title 	= {Voice Over IP Performance Monitor},
	journal = {ACM Computer Communication Review},
	year 	= {},
	volume 	= {},
	number 	= {},
	pages 	= {9-24},
	month 	= {}
}


@inbook{QoSinWAN:Uyless,
   author    = {U. Black},
   title     = {QoS in Wide Area Networks},
   chapter   = {1},
   pages     = {2-24},
   year      = {2000},
   publisher = {Prentice-Hall Inc.},
   address   = {USA},
   edition   = {first}
}

@MANUAL{SIP:Flow,
    Author         = {Denise Donohue and David Mallory and Ken Salhoff},
    Title          = {Session Initiation Protocol:SIP call flow},
    URL            = {http://www.ciscopress.com/articles/article.asp?p=664148&seqNum=2},
    Note           = {Last Accessed: 27 July 2009}
}